Identify the correct statement on 'inhibin' -
- Is produced by granulose cells in ovary and inhibits the secretion of FSH
- Is produced by granulose cells in ovary and inhibits the secretion of LH
- Is produced by nurse cells in testes and inhibits the secretion of LH
- Inhibits the secretion of LH, FSH and Prolactin
The Correct Option is A
Solution and Explanation
The correct answer is Option 1: Is produced by granulosa cells in ovary and inhibits the secretion of FSH.
Explanation:
Inhibin is a glycoprotein hormone that plays a key role in regulating the reproductive system.
In females, inhibin is produced primarily by the granulosa cells in the ovaries. It inhibits the secretion of FSH (Follicle Stimulating Hormone) from the anterior pituitary gland, helping to regulate the menstrual cycle and follicular development.
In males, inhibin is produced by the Sertoli cells in the testes and serves to inhibit the secretion of FSH, not LH.
Breakdown of Options:
Option 1: Correct. Inhibin is produced by the granulosa cells in the ovaries and inhibits the secretion of FSH.
Option 2: Incorrect. Inhibin inhibits FSH, not LH.
Option 3: Incorrect. While inhibin is produced by nurse (Sertoli) cells in testes in males, it inhibits FSH, not LH.
Option 4: Incorrect. Inhibin specifically inhibits FSH secretion, not LH and prolactin.
Conclusion:
Option 1 is the correct statement about inhibin.
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Concepts Used:
Human Reproduction
Reproduction in human beings involves the fusion of male and female gametes that produces in their reproductive system.
Male Reproductive System:
The male reproductive system comprises:
- Testicles (testes): A pair of oval-shaped organs masked in a pouch known as the scrotum. They manage the production of sperms and the male hormone testosterone.
- Scrotum: It is a sac-like organ that hangs under the penis and behind it. It is the house of the testes, or testicles, and maintains a temperature that is needed for the production of sperm by it.
- Vas deferens: The sperms produced in testes are stored in a tube known as the epididymis. Here the sperms get matured and pass to the urethra via the muscular tube known as vas deferens.
- Accessory glands: This includes three glands, namely the prostate gland, seminal vesicles, and Cowper’s gland. The secretions from the mentioned three glands mix to form a fluid known as semen. Semen nourishes the sperm, raises the volume, and helps in lubrication.
- Penis: The penis is a cylindrical tube that serves as both an excretory organ, and a reproductive organ. It transfers sperms into the vagina during sexual intercourse.
Female Reproductive System:
The female reproductive system is active before, during, and after fertilization as well. It comprises the following parts:
- A pair of ovaries: A pair of ovaries produce and stores ovum in them. They also produce a female hormone known to be estrogen.
- Fallopian tubes (Oviducts): They are the area of fertilization. They connect both the ovaries with the uterus.
- Uterus: Uterus is the place of development for the embryo.
- Vagina: The part that connects the cervix to the external female body parts is called a vagina. It is the passage for the penis during coitus as well as a fetus during transfer.